For PS4, one thing is for certain, it finally gets cut to $249, at least. This Sept will be 3 years since the PS4 has had a permanent cut, so it is overdue. It will definitely have the same $199 deal at BF, though I'm not sure what game will come with it. Either TLOU 2, Days Gone, or they may do two games, like Spider-Man and GOW.
For PS5, I think there are really only two possibilities. They announce it early this year, or possibly around E3, with their own press conference, and it launches late this year. This is definitely a possibility, considering the next COD was being called "next gen" in a recent job listing. Or they will announce it at PSX this year, around Dec, to mark Playstation's 25th anniversary. This would mean a launch sometime in 2020. There will definitely be a PSVR 2.0. And all signs point to PS4 B/C, though given some statements from Sony, I think they will make it B/C with all previous PS consoles. Can't have all of those classics just sit in the store, with no one to buy them or nothing to play them on.